Patent GB-1015426-A (GB)
Title: Gold secondary mercaptides and decorating compositions containing the same
IPC: C23C18/02
Filed: 1962-08-29
Abstract: Resinous compositions comprise a gold secondary mercaptide of the formula <FORM:1015426/C4-C5/1> where R and R1 represent, the same or different, alkyl, cycloalkyl, aryl or aralkyl hydrocarbon radicals, a vehicle therefor and a gold flux.  The flux may contain salts and resinates of rhodium, iridium, bismuth, chromium, lead, cadmium, tin, copper, cobalt, antimony and uranium.  The vehicles include simple solvents, e.g. methyl ethyl ketone, cyclohexanone, ethyl acetate, amyl acetate, "Cellosolve" (Trade Mark), butanol, nitrobenzene, toluene, xylene, petroleum ether, chloroform and carbon tetrachloride, essential oils, e.g. oil of lavender, rosemary, aniseed, sassafras, wintergreen, fennel and turpentine, terpenes, e.g. pinene, dipentene and dipentene oxide, Assyrian asphalt and various rosins and balsams.  Special vehicles, e.g. waxes and thermoplastic resins may be used.ALSO:A method for coating material with gold comprises coating the metal with a composition which contains a secondary gold mercaptide of the formula: <FORM:1015426/C6-C7/1> where the symbols R and R1 represent the same or different alkyl, cycloalkyl, aryl or aralkyl hydrocarbon radicals, a vehicle therefor and a gold flux followed by firing.  The flux may contain the resinates of rhodium, indium, bismuth, chromium, lead, cadmium; tin; copper, cobalt, antimony and uranium, and the vehicle for the gold mercaptides is organic solvents, mixtures of essential oils, terpenes and rosins.  In examples, the firing is carried out at a temperature from 150-800  DEG C. Materials which may be coated include plastics, plastic laminates, wood, paper, textiles, leather, stainless steel, aluminium, titanium, glass, ceramics and quartz.ALSO:Asphaltic compositions comprise gold secondary mercaptides of the formula <FORM:1015426/C3/1> where R and R1 represent the same or different alkyl, cycloalkyl, aryl or aralkyl hydrocarbon radicals, a gold flux and a vehicle therefor, and asphalt.  The flux contains salts or resinates of rhodium, iridium, bismuth, chromium, lead, cadmium, tin, copper, cobalt, antimony and uranium.  The vehicle may be a solvent, e.g. methyl ethyl ketone, cyclohexanone, ethyl acetate, amyl acetate, "Cellosolve" (Trade Mark), butanol, nitrobenzene, toluene, xylene, petroleum ether, chloroform and carbon tetrachloride; a terpene, e.g. pinene, dipentene and dipentene oxide; an essential oil, e.g. oil of lavender, rosemary, aniseed, sassafras, wintergreen, fennel and terpentine, various rosins and balsams.  Waxes and thermoplastic resins may also be present.ALSO:The invention comprises gold secondary mercaptides of the formula <FORM:1015426/C2/1> wherein the symbols R and R1 represent alkyl cycloalkyl aryl or aralkyl hydrocarbon radicals the same or different, and a method for the preparation by reacting an alkyl sulphideaurous halide complex of the formula R112S.AuX wherein the symbol R11 represents an alkyl group having 1 to 8 carbon atoms and X represents a halogen atom with a mercaptan of the formula <FORM:1015426/C2/2> The gold secondary mercaptides may also be made by reaction of a secondary mercaptan of the previous formula with a gold salt preferably auric chloride or potassium chloraurate or a corresponding bromo- or iodo-compound for example at temperatures of 0 DEG  C. to about 100 DEG  C.; preferably by mixing the gold salt and mercaptan in a solvent e.g. ethyl acetate or methanol at 10 DEG  to 50 DEG  C. and raising the temperature to 60 DEG  to 80 DEG  C.  The alkyl sulphide-aurous halide complex may be prepared by the reaction of an alkyl sulphide with gold halide in the presence of water between 0 DEG  and 40 DEG  C.  The complex is preferably not isolated but used directly in the preparation of a gold mercaptide referred to above.  Alkyl disulphides are formed in the reaction of a gold halide with a secondary mercaptan according to the formulae <FORM:1015426/C2/3> wherein R and R1 have the above significance.